The answer to your question is "maggots"
Krill are Ocean Herbivores. They eat algae & Plankton.
It's C! It changes as new evidence is found.
Your answer is B, cell wall.
I think it would be to exchange gases. When you think about it, plants in the past were always underwater. They didn't have any air. Now, they are on land and need to be able to exchange gases from the leaves to the roots.
